Experimental Investigation of 3-D Crack-Tip Deformation Using Moire´-Sagnac Interferometry

Abstract

A combined moire´-Sagnac interferometry method was applied for in-plane and out-of- plane crack-tip surface deformation measurement. Based on 2-D and 3-D Jacobian derivative method (JDM), a stress intensity factor evaluation procedure is proposed. This procedure utilizes selected measured displacements around the crack-tip region as input nodal displacements to calculate the stress intensity factor and the results correlate well with the theoretical calculations. The extent of the 3-D crack-tip deformation zone is also discussed.

Effects of PH3 Contaminant on Solid Oxide Fuel Cells Performance and Related Anode Surface Temperature Measurements

“…A NexTech Probostat ™ (Lewis Center, OH) button cell test apparatus was modified and integrated with a Sagnac interferometric optical setup and IR thermometer (OMEGA OS3707, OMEGA Engineering, Stamford, CT) 16–18 . The optical setup consisted of a 20 mW diode laser (wave length λ=658 nm, laser spot size diameter=2 mm), beam splitters, a polarizer, and beam‐directing mirrors.…”

“…A NexTech Probostatt (Lewis Center, OH) button cell test apparatus was modified and integrated with a Sagnac interferometric optical setup and IR thermometer (OMEGA OS3707, OMEGA Engineering, Stamford, CT). [16][17][18] The optical setup consisted of a 20 mW diode laser (wave length l 5 658 nm, laser spot size diameter 5 2 mm), beam splitters, a polarizer, and beam-directing mirrors. A long-distance microscope fitted with a CCD camera was used to record the fringe patterns corresponding to out-of-plane surface rotation and a PhotriX IR pyrometer (Oakland, NJ) was used to measure the cell surface temperature on the same spot.…”

Development of an In Situ Surface Deformation and Temperature Measurement Technique for a Solid Oxide Fuel Cell Button Cell

“…A NexTech Probostat ™ (Lewis Center, OH) button cell test apparatus was modified and integrated with a Sagnac interferometric optical setup 19,20 and infrared (IR) thermometer. As shown in Fig.…”